Q: Can a curved surface have any straight lines like a semicircle for example?

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A semicircle

None A semicircle is the shape of a protractor (or half a pizza). It has one straight side and one longer curved edge.

To find the perimeter of the curved section of the semi-circle: Perimeter of semicircle = Pi x radius If you also need to the find the perimeter of the straight part of the semicircle (the diameter), it is simply double the radius.

Yes.

No. It's straight through the center of the sphere that the curved surface is part of.

Related questions

A semicircle

None A semicircle is the shape of a protractor (or half a pizza). It has one straight side and one longer curved edge.

To find the perimeter of the curved section of the semi-circle: Perimeter of semicircle = Pi x radius If you also need to the find the perimeter of the straight part of the semicircle (the diameter), it is simply double the radius.

Yes.

There are infinitely many possible answers. Two of the more common shapes are semicircle and quadrant.

No. It's straight through the center of the sphere that the curved surface is part of.

Neither, it depends on what you are trying to accomplish.

Well, if you had a shadow cast on earth, it would appear curved because the of the Earth's surface is curved

A semicircle is a two-dimensional shape that is half of a circle, with a flat edge as the diameter. A hemisphere, on the other hand, is a three-dimensional shape that is half of a sphere, with a curved surface. Essentially, a semicircle lies in a plane, while a hemisphere is a solid object.

A tangent

its a lens...1 curved edge = a circle, 1 flat surface = back, 1 curved surface = front. (these are used in some battery-less flashlights, as an example.)

A circle is two semicircles put together. The circumference of a circle is the length around it, so half of that would be what you are aiming for. Let's call the circumference "c" and the radius (the straight part of the semicircle) "r". Pi is also needed in this problem, so we can use "π". The equation for the circumference of a circle is c=2πr. Replace "r" with the length of the straight part of the circle, and do the math. Divide your answer by 2.Example:r=2c=2πrc=2π2c=4πc=(approximately)12.5712.57 divided by 2 equals approximately 6.29.The length of the curved part of the semicircle is 6.29!Hope this helps!